<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{margin: 0;padding: 0;}
        html,body{
            height: 100%;
            width: 100%;
            overflow: hidden;
            background: url(./images3/bg.jpg) no-repeat;
            background-size: 100% 100%;
        }
    </style>
    <script src="./js/animate.js"></script>
</head>
<body>
    <script>
        class Fireworm{
            constructor(){
                this.el=document.createElement("div");
                document.body.appendChild(this.el);
                this.el.style.width="20px";
                this.el.style.height="20px";
                this.el.style.position="absolute";
                this.el.style.backgroundImage="url(./images3/1.jpg)";
                this.el.style.backgroundRepeat="no-repeat";
                this.el.style.backgroundSize="100% 100%";

                this.el.style.left=this.location().left+"px";
                this.el.style.top=this.location().top+"px";
            }

            location(){
                return{
                    left:parseInt(document.documentElement.clientWidth*Math.random()),
                    top:parseInt(document.documentElement.clientHeight*Math.random())
                }
            }
            fly(){
                tools.animate(this.el,this.location(),()=>{
                    this.fly();
                })
            }
        }
        for(var i=0;i<10;i++){
            new Fireworm().fly();
        }
    </script>
</body>
</html>